In the app management page for a little app I made, the following statement is presented below this key Pw9D)judG8FE4tJR3qjUTA((:

Pass this as key when making requests against the Stack Exchange API
to receive a higher request quota.

Based on the "higher request quota" documentation, it's safe to assume that "higher request quota" is the upgrade from 300 to 10,000 requests per day per ip (my users are not authenticating). But, passing the key along with the initial request has had no affect, and I already verified multiple times that the key is correct. Here's the code for that call: